Wrench.



' UNITED STATES PATENT OFFICE.

I JOHN o; PARxEaoF PHILADELPHIA, PENNSYLVANIA.

"WRENCH.

Specification of Letters Patent.

Patented Oct. 6, 1908.

1 Application filed. January 30,1908. Serial No. 413,431.

To all whom it may concern) I I Be it known that I, JOHN C. PARKER a citizen of the United States, residing at Phil-- adelphia, in the county of Philadelphia and State of Pennsylvania," have invented a I/Vrench, of which the following is a specifi cation.

This invention is a wrench designed particularly for engaging hand hole covers of junction boxes, to handle, turn and grind them upon their seats.

In the accompanying drawings, Figure 1 is a sectional elevation showing the invention applied to aihand hole cover of a junction box; Fig. 2 is a sectional elevation of part of the same mechanism viewed at right an gles to the position shown in Fig. l, and Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1. I r f In the form represented in the drawings, the wrench comprises. the shank 1 having fixed at one end thereof the handle 2 and at the opposite end the T-head 3. A collar at (providing a bearing) is fixed on. an intermediate part of the shank, and a collar 5 (providing a bearing and a knob) is movable revolubly and longitudinally on the shank intermediate of the head 3 and'the collar 4, the collar'5 being providedwith the projections 6 parallel with the shank and de signed to engage the head between them or to register with its projecting ends disposed in the plane thereof. A coiled spring 7 is placed on the shankbetween the collars 4:,

and 5, being held by the former so as to'act upon the latter which is movable thereby towardthe head 3. The junction box 8 has the hand hole 9 towhich is fitted the circular cover 10 having the hollow body ll-provided with the rectangular slot or opening 12, the

body of the cover beingadapted for engag ing'it to the junction box and forthefconnection ofthe wrench thereto, tohold, 1121 115 dle and grind it upon its seat. I

To arrange the wrench for engagement with the cover, the movable collar is used as a knob, drawn back against the action of the spring andturned untilthe-projections thereon are brought into. the plane of the T-head, when the head and projections can be thrust through theslot in the body of the cover. Withthe parts so inserted, by turning the shank through" a quadrant, the head is revolved to a position'transverseto the plane of the projections and is drawnb'a ck A between them by the action of the spring with the pressure on the handle relaxed. The co'ver'is thus locked to the wrench, the projections engaging the slot in which they cannot be turned and the head extending transversely to theslot between the projections within the body.

It'will be understood that the wrench may be disengaged and removed by drawing back the collar 5, against the action of the spring 7 ,until the projections 6 clear the head 3 and the shank then turned to bring the head parallel with the slot.

. While this wrench is designed particularly for holding, handling and grinding covers for junction boxes, including boiler headers, it is manifestly available and is intended for analogous uses with other devices, such,

for example, as grinding valves on their seats. j Having descr bed my invention, I claim:

1. A wrench comprising a shank having a transversely extending member fixed to an end thereof, and a device revolubly and longitudinally movable on said shank, said device having a member for engaging said transverse member to prevent relative revolution of said parts.

2.. A wrench having} a shank with a T- 7 head, a device having projections revolubly and longitudinally movable on said shank so as to be placed in either free or interlocking relation with said head.

. 3. A wrench having a shankwith a T- head, a collar with projections movable revolubly and longitudinally on said shank, a

collar fixed to said shank, and a spring between said collars.

v J OI-IN C. PARKER.

' Witnesses:

ROBERT JAMES EARLEY, J (as. DENNY, Jr. 

